Apparatus for preparing old and new molding-sand.



G. HGFEMANN APYARATUS FOB. PRPPAMNG om AND NEW MDLDING SAND.

APPLIUTYGN ULEB SHE?, il. 1909.

3 SML; ivf L G. HFFMANN. APPARATUS FOR PREPARING OLD AND NEW MLDINGSAND. APPMOATMN FILED 11E1 T.11,19o9. 1111111111151) JULY 5,1912.

1,036,239. Patented Aug. 2o, 1912.

B SHEETS-SHEET 2.

i l l l 2 l l 1 G. HOFFMANN. MJPARTUS FOB. PREPARING OLE? A APPLIUATINFILED SEPT. l?,

ted Aug. 20, 1912.

Meer;

3SHI1I1TS-SHEET 3.

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Patented A110'. 20,1912.

..3 '3699. Srrial NQ. 6173.230. Rriewed Jiiiy 5, 1912. Serial No,707,908.

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The* apparatus whirh forum thc i\1|l jrct mailer mi thin` iiivciiiiuiicomprimh thervfure in he mum :i mill fur the old simil uml :l,iiipirutiis for 'die salmo, similar de for the new simil, a mixing(lv/vive for 'iiriri :if simil und zi wntziiiior for mul duri, #arialinist, minimi mgrmliclii living added iii ihr; cmispnnimii.

.X i m iw iiiifieersiuml thi-i in lh@ follow- :igirwr riimi', i6. .Miupmiiizf; 1T may hc proviilifi nl thv iwi il lhs casing' so that thewssihle for impec rm und repair. ThiA "lfm: mili fr Ur Losses mixingmachine finally are driven from the shaft fm, by means of the pulleys 6?and 68 which are connected with the shaft m, by one straight and onecrossed belt respectively as indicated in Fig. l,

A shaft T0 carries a worm T which is driven by a belt, not shown, fromthe pulley 74. The worm gear 77 is ei'maged with the hob T1 mounted onthe shafte3, and imoarting therchy slow rotating movementto the same.-The shaft T3 is prov led at. each end with a transverse meniloer 4 saidmember being connected with the slides 75 and 75 respectively forclosing or opening the .inlet and outlet apertures respectively of thecasing 14 of the grinding millu These transverse members are placed onthe shaft 73 so that the slide 75 is in closing,r position when slide 75is open and vice versa. The obiect of this arrangement is to prevent thesand thrown through the feeding aperture i4. from leaving the Igrindingrmill heitere it has undergone the grinding operation.

From the foregoing;i it will be seen that the raw materials singlyconveyed to machine are discharged therefrom finely crushed andthoronghl 1 mixed Ywith eac-h other. lt is also obvious that in thecompendious structure of the machine not more than one attendant isrequired to watch the various devicesand operate the same. lt isu'thermore obvious that the entire drive for the machine is derived froml ne main shaft I which is readily a ice' :ible 'tor oiling and which inthe embodiment shown may easily be inspected from the ground loor or themachine. YIt is furthermore obvious that. in this structure thenecessity of huilding a plurality of undaments for several machines isdispensed with and a considerable saving is connected with this feature,

l. claim 1. A machine for preparing molding sand comprising` incombination, a. device for reducing new sand from coarse to finecondition, a device for sifting the tine new sand, a. device forcrushing and sifting old sand, separate conveying met-lis tor sand fromthe aforesaid devices respecti ey, a common conveying means for saidsands, a device 'for intel-mixing both. kinds of sand, said commonconveying means leading said sands to said mixing device, commonactuating means for said devices and conveying means, and means foradding coal-dust to .the sands.

Q. A machine for preparing molding sand, comprising in combination, adevice 'for reducincv new sand from coarse to fine condition, a. deviceVfor sifting the fine new sand, a device `for crushing and sifting oldmolding sand, separiie means i' conwayinlJ said sands .in verticaldireotfor from s: 'd ducing and crushing dei common .ine-nis for convsand in horii/ nml tica termixing'both kinds of sands, said commonconveying means leading the sand to the intermixing device, means t'oradding coaldust to the sands` and common actuating means for saiddevices and conveying means.

A machine for preparing molding` sand, comprising,` in comhii'iation, agrinding mill for new sand, a sifting device for ground new sand, ameans 'for conve-ying ground new upwardly to the sitting device, acrushing and sifting mill for old molding sand, means for conveying oldmolding sand upwardly from said crushing` mill, a third conveying meansfor looth kinds ot sand in common and forintermixing said sanos, asecond device for intcrmixing said sands, said common conveying meansleading to said intermixing device, means for adding coal-dust. to themixture, and common actuating means for said devices and conveyingmeans.

4. li machine for preparing moldingsand, comprising in combination, agrinding mall. for new sand, a sifting device 'for `ground new sanddisposed above said mill, means tor conveying,- `sand from said mill losaid sifting device, a. crushing and sitting mill for old molding sanddisposed below said sifting de Je, means for conveying sand from saidcrushing mill upwardly, a third conveyer, means for leading sand fromsaid second conveying means to said third conveyor, means -for leadingfsand from said sifting; device to said 'third conveyer, an intermixingdevice for both kinds of sand disposed on a len-el below said siftingdevice, d third conve-yer leading both kinds ot" rd said ruining device,a device for adding coal-dust to the sands, andlactuating means for saiddevices and conveying means.

5. A machine for preparing molding sand, comprising in combination, agrinding mill for new sand, a device for sifting ground new sanddisposed above said mill, means for conveying sand from said mill tosaid sitting device., means for leadingl unsifted sand from the sittingdevice hack to the mill, a crushing and sifting mill for old moldingsand disposed. below said sifting; device, means Yfor conveying sandfrom said Crushing mill upwardly, a third conveyer, means for leading;sand from said second conveying means to said third conveyer, means forleading siftcd sand from said sifting device to said third conveyor, adevice for inter-mixing both kinds of sand disposed on a'lcvel belowsaid sifting device, said third.. .rnvcycr leading both kinds of sandtoward said mixing device, a. device tor adding coaldust to the sands,and :mtuatinggr means for said devices and conveying means.

6. A ina-chine ior pri tiring mol-'fling sand, comprisi.., in combi iona grinding mill for nevi sand, a, sifting device for ground new sanddisposed above said mill, a means for conveying ground sand from saidmill lo said sifting device, a crushing and Sife ing mill for oldmolding sund in jnxiuposition to said grinding mill, ineens for conveying sand from said crushing niill lo e primary mixingy und conveyingdevice, means for leading sifted new sand from the sifting device losaid mixing and conveying device, said primary mixing and conveyingdevice being disposed at e level above said mills, a secondary mixingdevice disposed zit a level with said mills, means for adding coal-dustto the mixture, and actuating lne-ans for seid mills and conveyers.

7. A machine for preparing molding sund, comprising in combination ngrinding mill for new sand, a sifting device for ground new sanddisposed above sii-id mill, u ineens for conveying ground new sund fromsaid mill to said sifting device, a crushing and sifting mill for oldmolding send disposed in close juxtaposition to said grinding mill, ameans for conveying sand from said crushing mill upwardly, both of saidconveyinr means being disposed opposile cach ot er, a primary mixing andconveying de vice disposed at a level shove seid mills, means forlending crushed old send from said second conveying means to said primary mixing and conveying device, means for leading sifted new sand`from said sift4 ing device to said primary mixing and conveying device,a, secondary mixing device, said primary mixing device lending the sandstoward said secondary mixing device, means for adding coal-dust lo themixture,

l l l l l l l incense and actuuing means for said mills, conveyers anddevices,

8. A machine for preparing molding sand, con'iprising in combination, egrinding mill for new sand, e, sifling device disposed above said mill,n means for conveying ground new sand from the mill to said siftingdevice, :i chute for lending unsifted send from said sifting device tosaid mill7 e conveyor disposed below seid sifting device, another chuteextending from said sifting device to said conveyor, e crushing andsifting mill for old sand disposed in close juxziposilion lo saidgrinding mill, zi second conveyer disposed above seid mills :ind belowseid irsl named conveyer e. third chute lendingl from seid first namedconveyer to said second eonveyer, e means for conveying old crushed sandfrom said crushing mill to said second conveyer, said means forconveying` new ground sand and old crushed sand being disposed ondifferent sides respectively of `ihe machine and opposite each other, :imixing device disposed nl a level with seid mills, said second conveyerleading the sund towiird sind mixing device, :L bin conl'nining coaldnstdischarging into suid second conveyer, and common zictimiixig moans forsnid mills, devices und convey/ers.

In testimony whereof l have hereunto set my hund in presence of lwosubscribing Witnesscs.

Witnesses HARRY Finennnions, lin/imno LssicNuov.

